Spark-plug



H. W. ASCHINGER.

SPARK PLUG.

Patented Mar. 2, 1920.

UNITED STATES PATENT OFFICE.

HARRY W. ASCHINGEB, OF EVANSVILLE, INDIANA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF ONE-THIRD TO WALTER W. CARSON, OF EVANSVILLE, INDIANA, ONE-THIRD TO FLORENCE VAN D. CARSON, AND ONE-THIRD TO OSCAR STAHL AND EDWARD F. STAHL, BOTH OF VANDERBURG COUNTY, INDIANA.

srmx-PLUG.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed January 17, 1918. Serial No. 212,274.

To all whom it may concern:

Be it known that I, HARRY W. Asomncnn, a citizen of the United States, residing at Evansville, in the county of Vanderburg and State of Indiana, have invented certain new and useful Improvements in Spark- Plugs, of which the following is a specification. I

This invention relates to new and useful improvements in spark plugs for hydro-carbon engines, and the primary object of the invention is to provide a spark plug of this character provided with an attachment, that prevents the formation of carbon deposits on the bottom -of the insulating core which would short circuit 'the spark plug, and prevent its operation in the usual manner.

In operation, carbon tends to form on the bottom of the insulating core within the plug, and carries the current from the positive electrode across the chamber within the bottom of the plug to the casing, thereby defeating the primary purpose of the lug, by preventing the spark gap at the ottom thereof. My invention will prevent the formation of carbon at this point, and will not affect the usual operation of the plug in any manner.

Another object of'the invention is to provide a device of this character which is easily and simply constructed, inexpensive to manufacture,'and one which will be very eflicient in o eration.

W1th these and numerous other objects in view, my invention cpnsists of the novel features of construction, combination, and

arrangement of parts, which will be herein referred to and more particularly pointed out in the specification and claims.

In the accompanying drawings:

Figure 1 is an elevation of a spark plug, showing the lower portion thereof in section, with the positive electrode and bottom of the insulating core in elevation,

Fig. 2 is a horizontal section on the line 22 of Fig. 1.

In describing my invention I shallrefer to the drawings in which similar reference characters designate corresponding parts throughout the several views.

The numeral 1 designates the casing of .the conventional type of spark plug, which has its lower end externally threaded as shown at 2, so the same will fit into the engine cylinder, while said casing surrounds the conventional type of insulated core 3 commonly used in spark plugs of this type. Positioned centrally through the core 3, is a positive electrode 4, that has one portion thereof designated 5, depending from the .core, which is positioned in the chamber forming the'lower end of the plug, and projecting below the lower edge thereof. A negative electrode 6, depends from the lower edge of the casing 1, and is bent at right angles, so that its extremity is positioned adj acent the positive electrode. The'upper end of the positive electrode 4 projects through the core, and has the usual type of binding means 7 ositioned thereon. This construction'is o the conventional type ordinarily used in spark plugs, and no claim is particuinvention resides for preventing carbon eposits forming on the lower portion of the core 3, that is posilarl'lg made upon the same.

rimarily, in means I tioned within the chamber in the lower end f of the spark plug. To carry out this object, I mount upon the depending portion 5 0f the electrode 4, a plunger plate 8, that has a limited slidable movement on this por lutely prevent the formation of carbon on the bottom of the core.

In operation, when the spark plug is in position, the plunger plate 8 will normally rest upon the stop 9, as clearly shown in Fig. 1 of the drawing. Upon the explosion, the plunger plate will be driven upwardly on the portion 5 of the electrode 4, against the bottom of the core 3, This will tend to keep the core clean, and prevent the formation of carbon deposits thereon. After the explosion, the plunger plate' will drop by its own weight back to normal position. The corrugated upper face of this plunger, creates a grinding action, that renders its operation more efficient, and absolutely prevents any carbon forming upon the face of the core against which it is projected.

This attachment, may be applied to the conventional type of spark plugs, with very little trouble, or the same may be manufactured with the plug. Its operation is very simple, and will absolutely carry out the advantages ascribed thereto. The force of the explosion drives the plunger against the lower base of the core with such force, that there is no possibility of carbon deposits forming thereon. This fault is the most Well known one in the ordinary type of spark plug, as carbon is liable to form thereon, across through the casing of the plug, and hence short circuit the. same. This attachment will certainly increase the elliciency of the plug, as well as lengthen the life of the same.

From the above description taken in connection with the accompanying drawings, it is thought that a clear and comprehensive understanding of the construction, operation, and advantages of my invention may be had, and While I have shown and described the device. as embodying a specific structure, I desire that it be understood that v such changes may be made in said structure as do not depart from the spirit and scope of the invention as claimed.

Having fully described my invention, what I claim is new, and desire to secure by Letters Patent, is:

1. A spark plug of the class described including an insulated core, an electrode depending therefrom, and a plunger slidably -mounted on said electrode and having a a cleaning plate on said plunger, said plunger being automatically driven against the loWer base of the core by the explosion and return to normal position by its own weight.

3. A spark plug of the class described including an insulated core, an electrode depending therefrom, a stop on said electrode disposed within the lower portion of the spark plug, a plunger slidably mounted on the electrode above the stop and automatically actuated by explosion within an internal combustion engine, and the upper face of said plunger being corrugated.

In testimony whereof, I affix my signature.

hereto.

HARRY W. ASCHINGER. 

